A natural gas furnace converts gas to heat. Gas furnaces are the most popular choice for the majority of modern homes with central heating and air conditioning. Keep your home warmer, your bills lower and make those winter months a little more enjoyable. Staying warm in the winter season is just a fraction of what you need. Doing it efficiently day and night, even on the record lows, that’s what a TRANE furnace gives you. Innovative furnaces with efficiency in mind. Combine with the ComfortLink™ II XL950 NEXIA Wireless Thermostat with color touch-screen display.